Saturday was Arthur Ashe Kids' Day at the US Open, and a bunch of the biggest names in tennis were part of the show.

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Most notably, six-time champion Serena Williams traded her catsuit for a tutu and jumped rope with the next generation.

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Multiple-time champions Novak Djokovic and Rafael Nadal took the court as well.

They were joined by 2017 finalist Madison Keys ...

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And 2016 champion Angelique Kerber.

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Afterward, Djokovic had a Kids' Day of his own, what he called "Kids’ Day Part 2 with my biggest fans."

The US Open kicked off on Monday, with Williams and Nadal headlining the Arthur Ashe Stadium night session.

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Stars hit the court
for Arthur Ashe 
Kids' Day

Stars hit the court for Arthur Ashe Kids' Day

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